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Smog warning for the Fourth of July

Watch out for smog on July 4. State health and environmental officials have issued an air quality health advisory for Sunday between 10 a.m. and 10 p.m., citing predicted high levels of ozone.

Ground-level ozone is a major component of smog and can aggravate respiratory problems, such as asthma. It forms on hot summer days when vehicle exhaust and emissions from out-of-state power plants react...

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